She does not have to wait for the drugs to "clear from her system".
When will surgeons and anaesthetists ever take the trouble to learn
about breastfeeding?  How much of any drug that they will be giving
will still be in the milk, or the blood for that matter, after 24
hours.  No need to stop at all.  Nurse as soon as the mother is up to
it.  The decision, incidentally, is up to the mother.

Until physicians take the trouble to learn something about
breastfeeding, they have *no* right to say anything about it.  Any
nursing mother looking for information is better off, in general,
asking my 14 year old son.

Jack Newman, MD, FRCPC